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- W3197998510 abstract "Recently, high-order topological insulators (HOTIs), accompanied by topologically nontrivial boundary states with codimension larger than one, have been extensively explored because of unconventional bulk-boundary correspondences. As a novel type of HOTIs, very recent works have explored the square-root HOTIs, where the topological nontrivial nature of bulk bands stems from the square of the Hamiltonian. In this paper, we experimentally demonstrate 2D square-root HOTIs in photonic waveguide arrays written in glass using femtosecond laser direct-write techniques. Edge and corner states are clearly observed through visible light spectra. The dynamical evolutions of topological boundary states are experimentally demonstrated, which further verify the existence of in-gap edge and corner states. The robustness of these edge and corner states is revealed by introducing defects and disorders into the bulk structures. Our studies provide an extended platform for realizing light manipulation and stable photonic devices." @default.
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- W3197998510 date "2021-09-02" @default.
- W3197998510 modified "2023-09-27" @default.
- W3197998510 title "Observation of Square-Root Higher-Order Topological States in Photonic Waveguide Arrays" @default.
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- W3197998510 doi "https://doi.org/10.48550/arxiv.2109.00879" @default.
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